<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区 -->
      <div class="avatar_box">
        <img src="../assets/logo.png" alt="" />
      </div>
      <!-- 登录表单 -->
      <el-form  ref="loginFormRef" :rules="loginFormRules" :model="loginForm" label-width="0px" class="login_form">

     <!-- 用户名 -->
        <el-form-item prop='username'>
          <el-input  v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
          </el-form-item>

          <!-- 密码 -->
          <el-form-item prop="password">
          <el-input v-model="loginForm.password"  type="password" prefix-icon="el-icon-unlock"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
           <el-button type="primary" @click="login">登录</el-button>
           <el-button type="info" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>

<script>
export default {
data(){
    return{
        // 登录表单的数据绑定
        loginForm:{
            username:'admin',
            password:'123456'
            },
            // 表单验证规则对象
         loginFormRules:{
            //  验证用户名
            username:[{required: true, message: '请输入用户名', trigger: 'blur' },
             { min: 3, max: 10, message: '长度在 3 到 10个字符', trigger: 'blur' }],
            // 验证密码
            password:[
                {required: true, message: '请输入密码', trigger: 'blur' },
             { min: 6, max: 15, message: '长度在 6 到 15个字符', trigger: 'blur' }
            ]
         }
    }
},
methods: {
    // 点击重置按钮，重置登录表单
    resetLoginForm(){
        this.$refs.loginFormRef.resetFields()

        // console.log(this);
    },
    login(){
        this.$refs.loginFormRef.validate(async valid=>{
            if(!valid) return
           const {data:res} = await this.$http.post('login',this.loginForm)
           if(res.meta.status !==200) return this.$message.error('登录失败')
           this.$message.success('登陆成功')
        //    将登陆之后的token保存到客户端的 sessionStorage
        // 项目中除了登录之外其他的API接口，必须在登陆之后才能访问
        // token只用在当前网站打开时生效，所以将token保存到sessionStorage
        // 通过编程式导航跳转到后台主页。地址是'/home
        window.sessionStorage.setItem('token',res.data.token)
        this.$router.push('/home')
        })
    }
},
};
</script>

 <style lang="less" scoped>
.login_container {
  background-color: #2b4b6b;
  width: 100%;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    background-color: #fff;
    box-shadow: 0 0 10px #ddd;
    img {
      width: 100%;
      height: 100%;
      border-radius: 50%;
      background-color: #eee;
    }
  }
  .btns{
      display: flex;
      justify-content: right;
  }
  .login_form{
      position: absolute;
      bottom: 0;
      width: 100%;
      padding: 0 20px;
      box-sizing: border-box;
  }
}
</style>